[hpsdr] Pre-Distortion

[Clyde Washburn]

Some of us already have taps in place for signal monitoring -- what is the actual desired tap level at the output to the receiver?

-----Original Message-----
From: hpsdr-bounces at lists.openhpsdr.org [mailto:hpsdr-bounces at lists.openhpsdr.org] On Behalf Of Helmut, DC6NY
Sent: Saturday, December 07, 2013 4:40 PM
To: 'n3evl'; hpsdr at lists.openhpsdr.org
Subject: Re: [hpsdr] Pre-Distortion

***** High Performance Software Defined Radio Discussion List *****

Hi Pete,

1)The pre-distortion method needs also a modified FPGA code which is at this time only available for the Hermes board. I'm rather
sure that the other OpenHPSDR exciter boards will follow.
2)I don't know whether any of the testers has used a tube amplifier in the chain. Basically it should work. You are right, the
sampler has to be inserted at the end of the amplifier chain directly into the feeder.

73, Helmut, DC6NY 

-----Ursprüngliche Nachricht-----
Von: hpsdr-bounces at lists.openhpsdr.org
[mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von n3evl
Gesendet: Samstag, 7. Dezember 2013 21:42
An: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] Pre-Distortion

***** High Performance Software Defined Radio Discussion List *****

Just a general question or two on the pre-distortion feature:

1) Will this be applicable to Atlas/Mercury/Penny based systems too or is it just for Hermes based systems?

2) Does the number of amplifiers in the chain matter - for instance my Penelope drives Munin which in turn drives my AL-811H (via
Alex) - so I'm assuming the TX signal going to the antenna is where the sampling and feedback would take place.

Thanks,

Pete, N3EVL


On 12/7/2013 10:51 AM, Helmut, DC6NY wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Hi All,
>
> The progress of the pre-distortion software is remarkable. I suppose 
> the general release is coming up soon. You will need an appropriate RF 
> sampler in the feedback loop to use this great functionality. For all 
> and especially for the home-brewers, who will be prepared for this 
> exciting date, I put some info about such a device on 
> http://www.hamsdr.com/dnld.aspx
>
> Season's Greetings.
>
> 73, Helmut, DC6NY
>
>
>
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